@inproceedings{345cf58faf8541dd9cafa6dd6e65a5d4,
title = "Design and performance of a sensor system for detection of multiple chemicals using an external cavity quantum cascade laser",
abstract = "We describe the performance of a sensor system designed for simultaneous detection of multiple chemicals with both broad and narrow absorption features. The sensor system consists of a broadly tunable external cavity quantum cascade laser (ECQCL), multi-pass Herriott cell, and custom low-noise electronics. The ECQCL features a fast wavelength tuning rate of 2265 cm-1/s (15660 nm/s) over the range of 1150-1270 cm-1 (7.87-8.70 μm), which permits detection of molecules with broad absorption features and dynamic concentrations, while the 0.2 cm-1 spectral resolution of the ECQCL system allows measurement of small molecules with atmospherically broadened absorption lines. High-speed amplitude modulation and low-noise electronics are used to improve the ECQCL performance for direct absorption measurements. We demonstrate simultaneous detection of Freon-134a (1,1,1,2-tetrafluoroethane), ammonia (NH3), and nitrous oxide (N2O) at low-ppb concentrations in field measurements of atmospheric chemical releases from a point source.",
keywords = "Infrared spectroscopy, Quantum cascade laser, Tunable laser",
author = "Phillips, \{Mark C.\} and Taubman, \{Matthew S.\} and Bernacki, \{Bruce E.\} and Cannon, \{Bret D.\} and Schiffern, \{John T.\} and Myers, \{Tanya L.\}",
year = "2010",
doi = "10.1117/12.842120",
language = "English (US)",
isbn = "9780819480040",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
booktitle = "Quantum Sensing and Nanophotonic Devices VII",
note = "Quantum Sensing and Nanophotonic Devices VII ; Conference date: 24-01-2010 Through 28-01-2010",
}